The need to write it in an engaging manner while remaining professional makes this more challenging task for you. (essaymaxi.com)
To become and remain a professional in business, you must recognize that you are in charge of your own training and act on that fact. (tomhopkins.com)
While you might play a little with the structure and language of a business letter, recipients expect that some things remain professional at all times. (coverlettersandresume.com)